300 HP out of a 318, is it possible with bolt ons?

My Duster with a 318 that was 9.4-1 comp, Edelbrock heads and intake, NO whiplash cam, ran 11.70s 1/4 mile, it had to make around 300hp i figure.
300 horsepower at the flywheel put your car in the high 11's? That's roughly 240 - 255 to the ground. What gear ratio and stall speed converter did you have? I've been told that it takes 300+ horsepower at the wheels to get out of the 12's. But I don't know this as a fact.